I am tasked to find the amplitude of the first harmonic of a square wave.

enter image description here

enter image description here

  1. I did a time domain fourier series and plot a frequency spectrum

  2. I also did a frequency domain fourier series and plot a frequency spectrum.

I realised both frequency spectrums differ by half. May I know which is the correct representation of the frequency spectrum?.

  • 1
    \$\begingroup\$ If you use Google, you possibly get a faster answer. \$\endgroup\$ – Long Pham Feb 15 at 18:13
  • \$\begingroup\$ Well, we won't be able to tell you what you did wrong (and if) without you telling us what formulas exactly make up your time and frequency domain Fourier Series. I honestly only know one Fourier series, so I must admit I'm confused what you're doing. \$\endgroup\$ – Marcus Müller Feb 15 at 18:16
  • \$\begingroup\$ What do you mean by time domain fourier series? In your answer I only see frequency domain plots. The difference of two might be arising because you are using negative frequencies in one case. \$\endgroup\$ – sarthak Feb 15 at 18:17
  • \$\begingroup\$ I recall the two values: 4 and PI, being used as a scale factor. \$\endgroup\$ – analogsystemsrf Feb 16 at 4:10

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.